JON HAMM

Just before Mad Men's final season premiere in March 2015, Hamm revealed he'd completed a 30-day program for alcohol abuse, "with the support of his longtime partner Jennifer Westfeldt," according to a statement from his rep. The actor – whose show involves a fair amount of drinking – was never a regular on the club scene, telling PEOPLE in 2014, "I have a couple friends who run clubs and they'll call and say come out! And I'll go and say, 'Oh yeah, I forgot I don't like this. I feel like everybody's uncle or grandfather. I'm too old.'"